Question

You paint one wall of your room and leave a circle for your favorite sports team logo. The diameter is 3 feet.

Answer 1

A) The amount of tape that you need is equal to the circumference. The formula is pi times the diameter. 
3.14 x 3 = 9.42 feet

B) To find the area of the wall that gets painted, you take the area of the wall, W, minus the area of the logo.
The logo area is: pi x 1.5^2 = 7.065.
Therefore, the area of the wall will be: W - 7.065